Circularly polarized light source

Details Circularly polarized light source Circularly polarized light source

1976-05-05

1978-02-14

Bauer, Edward S.

350147, G02F 113

Patent

active

040735710

ABSTRACT:
There is disclosed a circularly polarized light source including a circular light polarizer using cholesteric liquid crystal material in an arrangement such that substantially 100% of the unpolarized light input may be utilized in a circularly polarized output in either a narrow band or wide band configuration. The circular polarizer itself comprises one or a plurality of liquid crystal cells having liquid crystal material of a predetermined ratio by weight of cholesteric to nematic liquid crystal type in each cell. The ratio of the types of materials determines a central wavelength to which each cell is tuned in its polarizing action. If a single cell is used, light of a predetermined bandwidth around its central wavelength is polarized. If a plurality of cells are stacked in a sandwich arrangement wherein each cell is tuned to a different wavelength selected in such a sequentially stepped fashion that the bandwidths for the cells form a continuous spectrum, then there is formed a wideband polarizer which can readily encompass the entire visible wavelength region of the spectrum.

REFERENCES:
patent: 3669525 (1972-06-01), Adams et al.

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